<button class="btn btn-primary btn-lg"
  v-on:click="addToCart"
  v-if="canAddToCart">Add to cart</button>
  <button disabled="true" class="btn btn-primary btn-lg"
    v-else >Add to cart</button>
  <span class="inventory-message"				  //#A 
v-if="product.availableInventory - cartItemCount < 5"> //#B
Only {{product.availableInventory - cartItemCount}} left!
  </span>
